PETALODONTID.-®. 
OQ 
that of Ctenoptychius apicalis , the latter more approaching Petalodus. 
Since, however, it seems advisable to retain Ctenoptychius, Agassiz, 
as a genus distinct from Petalodus , C'. pectinatus must henceforth be 
quoted under the recently proposed generic name of Callopristodus. 
Callopristodus pectinatus (Agassiz). 
%'fs. p y/ .-1838. Ctenoptychius pectinatus , L. Agassiz, Poiss. Foss. vol. iii. p. 100, 
/Ft cCg/. V P 1 - 19 ' % s - 2 ~ 4 ' 
.fleLcteM 1838. Ctenoptychius denticulatus, L. Agassiz, tom. cit. p. 101, pi. 19. 
figs. 5-7. 
1841. Ctenoptychius pectinatus, E. W. Binney, Trans. Manchester Geol. 
Soc. vol. i. p. 169, pi. v. figs. 20, 21. 
1867. Ageleodus diadema, R. Owen, Trans. Odontol. Soc. vol. v. p. 340, 
pi. iv. 
1870. Ctenoptychius pectinatus, A. Hancock & T. Atthey, Nat. Hist. 
Trans. Northumb. & Durham, vol. iii. p. 115. 
1873. Ctenoptychius pectinatus, T. P. Barkas, Coal Meas. Pakeont. p. 18, 
pi. i. figs. 17-19. 
1874. Ctenoptychius pectinatus, W. J. Barkas, Monthly Rev. Dental 
Surgery, vol. ii. p. 440, figs, xiii., xviii., xix, 
1874. Ctenoptychius denticulatus, W. J. Barkas, tom. cit. p. 441. 
1882. Ctenoptychius pectinatus, T. Stock, Ann. & Mag. Nat. Hist. [5] 
vol. ix. p. 256, pi. viii. figs. 5-17. 
1888. Callopristodus pectinatus, R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 85. 
Type. Detached teeth; coll. Royal Society of Edinburgh. 
Margin of dental crown not acuminate; denticulations sharply 
pointed. 
Form, Loc. Lower Carboniferous : Scotch Coalfield. Coal- 
Measures : Northumberland, Yorkshire, Lancashire, Staffordshire. 
The occurrence of this species in the Rhsetic Bone-bed of Aust, 
recorded by J. W. Davis, Quart. Journ. Geol. Soc. vol. xxxvii. p. 424, 
must be regarded as extremely doubtful. 
r As/. Unil/. 
fVeuCsko-te L 
50098. Two teeth; Calciferous Sandstone, Burdiehouse, Edinburgh. 
Purchased, 1879. 
P. 4494. Eleven teeth; Blackband Ironstone, Edge Coal Series, 
Borough Lee, Edinburgh. 
Presented by Ramsay H. Traquair , Esq., M.D., 1884. 
41197, 45901. Seven teeth; probably from Borough Lee. 
Purchased , 1868, 1874. 
41196, 41734. Six teeth ; Coal-Measures. Newcastle-on-Tyne. 
Purchased, 1868, 1869. 
